Bernie Sanders’ campaign on Thursday officially served the Democratic National Committee with a lawsuit, alleging the organization unfairly revoked its access to voter file data.

Sanders’ campaign initially filed a suit in December and was facing a Thursday deadline to serve the committee with the suit. The allegations stem from a controversy late last year in which Sanders staffers improperly accessed information from Hillary Clinton’s data file after a firewall between the campaigns’ information was inadvertently dropped.

The DNC swiftly punished Sanders by cutting off his campaign’s access to their own voter file information — a move that incensed Sanders’ camp, which accused the DNC of blatantly favoring Clinton.

Sanders sued for negligence and breach of contract and sought $75,000 in damages from the DNC for temporarily freezing the data access.

But there’s still the possibility the matter could be settled out of court. The latest filing says the campaign and DNC “continue to engage in cooperative discussions in their efforts to resolve the pending litigation.”

“We are continuing to cooperate with the DNC to resolve the matter and hope to do so in short order,” Sanders communications director Michael Briggs said in a statement.

The DNC sounded a similar note, with press secretary Mark Paustenbach writing in an email Thursday, “We continue to have productive discussions with the Sanders campaign and look forward to resolving this matter.”